•35 Three children, each of weight 356 N, make a log raft by lashing together logs of diameter 0.30 m and length 1.80 m. How many logs will be needed to keep them afloat in fresh water? Take the den- sity of the logs to be 800 kg/m?.

6- The maximum blood pressure in the upper arm of a healthy person is about 120 mmHg. If a vertical tube open to the atmosphere is connected to the vein in the arm of the person, determine how high the blood will rise in the tube. Take the density of the blood to be 1040 kg/m³. FO R W HZQ KC V

2. Red Bordeaux wine ( Patr -0.984g/ cm") is poured the right arm of a U-tube filled liquid mereury ( Pmercuy =13.6 g/cm') causing Wine Wine into with 3.00cm the %3D raising mercury level on the left arm by 3.0 cm and the right arm dropping by 6.0 ст. Merury (a) Cirele the pressure equations in the table below which correetly identify the equal pressure points on the left arm and on the right arm. Circle the correct equations aecording the points labeled in figure e P P P P P P. PP P P P Ps P-P. P P Ps-Pa Ps Ps P. P PP (b) What is h, the height of the wine column in the left arm?

A raft is made of 11 logs lashed together. Each is 41 cm in diameter and has a length of 6.2 m . How many people can the raft hold before they start getting their feet wet, assuming the average person has a mass of 67 kg ? Do not neglect the weight of the logs. Assume the specific gravity of wood is 0.60.

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E 3. A spring is attached to the bottom of an empty swimming pool, with the axis of the spring oriented vertically. An 8.60- kg block of wood (density = 770 kg/m³) is fixed to the top of the spring and compresses it. Then the pool is filled with water, completely covering the block. The spring is now observed to be stretched twice as much as it had been compressed. Determine the percentage of the block's total volume that is hollow. Ignore any air in the hollow space. % 20 C $ 27 R 888 V % 5 T G tv MacBook Air 6: B P H & F7 N 8 M ( 9 AO K O P zoom CIA by m EA 04 M wies or the puffer delete 21 A A

A typical hot air balloon can carry 3–5 passengers in a wicker basket and has a total mass of  m = 470 kg  including passengers, not including the mass of air inside the balloon. The density of hot air inside the stationary balloon is  ?hot = 0.960 kg/m3  and the density of the cooler outside air is  ?cool = 1.22 kg/m3. Determine the volume of hot air required for the balloon to be in equilibrium so that it neither sinks nor rises in the air.